Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..761c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 194, Mar. 1981, p. 761-769.
Astronomy and Astrophysics
Astronomy
87
Eclipsing Binary Stars, Light Curve, Stellar Models, Stellar Spectrophotometry, Variable Stars, Bolometers, Brightness Temperature, Electrophotometers, Radial Velocity, Stellar Luminosity, Stellar Mass Accretion, Stellar Motions, Stellar Radiation
Scientific paper
Photometric observations are presented which support the binary nature of SS 433, the remarkable X-ray, radio and visual source which exhibits periodically varying Balmer and He I line redshifts. The photoelectric B, V measurements were obtained over a five-month period and were correlated with the 165.5-day precession period of the moving emission features. The light curves are found to be similar to those of an eclipsing binary system with an orbital period of 13.09 + or - 0.04 days, in agreement with the spectroscopic orbital period. The primary minimum of the light curve is found to correspond to the maximum of radial velocity, presumably connected with the eclipse of the accretion disk surrounding a collapsed object by the normal star. The mean brightness of the object and the amplitude of the 13.09-day periodicity are also observed to differ in different phases of the 165.5-day precession period, indicating the variable contribution of the accretion disk to the optical luminosity of the system. On the basis of a model of SS 433 as an eclipsing binary system, an average disk brightness temperature twice that of the normal star and a disk bolometric luminosity of 10 to the 39th erg/sec are estimated.
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